x86: setup_force_cpu_cap(): don't do clear_bit(non-unsigned-long)

Another hack to make proper prototyping of x86 bitops viable.

Cc: Andrea Arcangeli <andrea@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>